mirror of https://github.com/ArduPilot/ardupilot
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/// @file AC_HELI_PID.h
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/// @brief Helicopter Specific Rate PID algorithm, with EEPROM-backed storage of constants.
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#ifndef __AC_HELI_PID_H__
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#define __AC_HELI_PID_H__
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#include <AP_Common.h>
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#include <AP_Param.h>
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#include <stdlib.h>
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#include <math.h>
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#include <AC_PID.h>
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// Examples for _filter:
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// f_cut = 10 Hz -> _filter = 15.9155e-3
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// f_cut = 15 Hz -> _filter = 10.6103e-3
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// f_cut = 20 Hz -> _filter = 7.9577e-3
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// f_cut = 25 Hz -> _filter = 6.3662e-3
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// f_cut = 30 Hz -> _filter = 5.3052e-3
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#define AC_HELI_PID_D_TERM_FILTER 0.00795770f // 20hz filter on D term
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/// @class AC_HELI_PID
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/// @brief Object managing one PID control
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class AC_HELI_PID : public AC_PID {
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public:
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/// Constructor for PID that saves its settings to EEPROM
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///
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/// @note PIDs must be named to avoid either multiple parameters with the
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/// same name, or an overly complex constructor.
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///
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/// @param initial_p Initial value for the P term.
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/// @param initial_i Initial value for the I term.
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/// @param initial_d Initial value for the D term.
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/// @param initial_imax Initial value for the imax term.4
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///
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AC_HELI_PID(
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const float & initial_p = 0.0,
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const float & initial_i = 0.0,
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const float & initial_d = 0.0,
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const int16_t & initial_imax = 0.0,
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const float & initial_ff = 0.0) :
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AC_PID(initial_p, initial_i, initial_d, initial_imax)
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{
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_ff = initial_ff;
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}
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/// get_ff - return FeedForward Term
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float get_ff(float requested_rate) const;
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/// get_leaky_i - replacement for get_i but output is leaded at leak_rate
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float get_leaky_i(float error, float dt, float leak_rate);
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static const struct AP_Param::GroupInfo var_info[];
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private:
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AP_Float _ff;
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};
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#endif // __AC_HELI_PID_H__
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